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Full text of "The manufacture and properties of iron and steel"

276
METALLURGY OF IRON AND STEEL.
when all the pieces were rolled from billets of the same size and on the same mill.
The decrease in ultimate strength by annealing the Bessemer bars averaged 4175 pounds per square inch in the rounds and 5683 pounds in the flats, while the open-hearth was lowered 5134 pounds in the rounds and 7649 in the flats. In this important and fundamental quality the two kinds of steel are very similarly affected, but in other particulars there seems to be a radical difference which is difficult to explain,                                                              ;
TABLE XV-B.                               '   j
Comparison of the Natural and Annealed Bessemer Steel Bars Given in Table XV-A, which show about the same Ultimate Strength.
		1			OT	ra di		i
	1&i	fi w		A H	g    .	o fl	c3~	4) O m
	ri o pi	c3	h	fl o1	ftp	00	2	0 ft
	43 QJOca	a	j|		._rt	a	cS	
	C Cj ^n ^r-t QJ	m W	<H O	W O)	"is	fl .	"H O	o H
		03	j^		M c3	O-ta	ti -W	n
	O 4J  tQ	ffl		Q3 ro	y! rj	2 ri	Ofl	^
								
a a	"gg-d s S S o	"H O	S S	IN	e*	a		S
8	J3&3	6	d	Sftfl-	-S ft	5 ft	'o ft	d
cs		ft	0	&	H		R	H
	56000 to	11	Natural	58869	42318	27.75	58.88	71.88
	60000	17	Annealed	56998	38796	29.49	66.18   .	68.06
	60000 to	6	Natural	62087	45323	27.04	55.31	73.00
	64000	9	Annealed	61694	42228	28.25	62.91	68.45
	64000 to	9	Natural	66241	47568	26.08	50.07	71.81
	68000	3	Annealed	65903	'44660	26.08	63.23	67.76
y\r	68000 to	3	Natural	70457	50203	24.75	48.80	71.34
	72000	4	Annealed	  71548	47643	25.81	57.53	66.59
	56000 to	11	Natural	58458	41698	81.45	56.13	71.33
	60000	15	Annealed	57780	38102	29.27	60.76	65.95
*\7T	64000 to	9	Natural	64621	45194	28.42	47.80	69.94
	68000	3	Annealed	64160 .	43770	28.58	59.50	68.22
VTT	68000 to	3	Natural	69773	49060	26.67	48.40	70.81
	72000	4	Annealed	08780	43508	26.38	51.00	63.34
The elongation of the Bessemer steel is increased by annealing in every, case except two, the average being 1.33 per cent., while the open-hearth metal shows a loss in three cases, with an average loss for all cases of 0.21 per cent. This is not very conclusive, but there is a more marked difference in the reduction of area, for in ;the Bessemer steel there is an increase in the annealed bar in every case varying from 7 to 15.18 per cent., while the- open-hearth